Gluconolactone is a type of Polyhydroxy acid (PHA). PHA is the next-generation of Alpha Hydroxy Acid, it exfoliates, hydrates without the irritation one might experience with AHA.
What are the benefits?
Gluconolactone gently removes dead skin cells from the skin's surface, resulting in smoother and even-toned skin. In the long run, it offers anti-aging benefits such as increased skin thickness and wrinkle reduction (though not as effective as more potent AHAs) It's an excellent moisturiser that also assists in the repair of damaged skin barriers.
Edison BL, Green BA, Wildnauer RH, Sigler ML. A polyhydroxy acid skin care regimen provides antiaging effects comparable to an alpha-hydroxy acid regimen. Cutis. 2004 Feb;73(2 Suppl):14-7. PMID: 15002657.
Grimes PE, Green BA, Wildnauer RH, Edison BL. The use of polyhydroxy acids (PHAs) in photoaged skin. Cutis. 2004 Feb;73(2 Suppl):3-13. PMID: 15002656.